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How old is glacier ice?
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Here is a sample of a page from a watermarked title:. File Last Updated:. This title was added to our catalog on December 16, Publisher Average Rating. See All Reviews. See all titles Need help? Customer Questions FAQ. DMsGuild Creator Questions? Contact us. Several reasons have been suggested for the cyclic nature of ice ages, although it is agreed that it cannot be attributed to a single cause.
The most widely accepted is the theory of Milankovich cycles, named after Milutin Milankovich, the Serbian scientist who suggested them. His theory was that the changes are caused by a combination of effects: alterations in the shape of the Earth's orbit around the Sun from nearly circular to much more elliptical; a change in the tilt of the Earth's rotational axis; and variations in the direction of the axis of rotation. These effects are known scientifically as eccentricity , obliquity and precession. Left to right: eccentricity, obliquity and precession. Modern glacial features.
Post glacial features evidence of ice in the British Isles.
Tasman glacier in New Zealand; a modern glacier. Glaciers are not static objects, they move very slowly, flowing under the weight of ice, and they grow and shrink, depending on the climatic conditions. If there is a greater amount of snowfall and low temperature then this will cause a glacier to grow as the snow is compressed into ice. In warmer periods the ice can melt and calve, forming icebergs and causing the glacier to shrink.
Glacier ice contains water, air bubbles, sediments and sometimes even trapped plants and animals. The water within the ice helps the glacier to move and slide over the ground. It also moves by moulding like plasticine and by passing over a softer substance like sand or gravel. In an area which has been glaciated, such as Britain, you can find evidence that glaciers were present not that long ago geologically speaking. Press Office. Online shops. Recent publications. Discovering geology. News and events.
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Ice and our landscape British ice coverage during the most recent glaciation — the 'Devensian'. Neolithic skull. Hand axe. Flint tool. These fossilised hazelnuts were found in a submerged forest, one of them still bears the evidence of being nibbled! The Irish elk or giant deer shown here next to its closest living relative, the fallow deer once roamed Britain well into the present interglacial period. It is thought to have become extinct about years ago according to radiocarbon dating of fossils.
Ice coverage in the world today. Modern glacial features Post glacial features evidence of ice in the British Isles Tasman glacier in New Zealand; a modern glacier.